Mobile device battery



FIG. 1 is a top plan view of a mobile device battery showing our newdesign;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational side view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines shown in FIGS. 1–5 are included for illustrativepurposes only and form no part of the claimed design.

The ornamental design for a mobile device battery, as shown anddescribed.